EP4167319A1 - Matériau d'électrolyte solide, électrolyte solide, procédé de production d'électrolyte solide et batterie entièrement solide - Google Patents

Matériau d'électrolyte solide, électrolyte solide, procédé de production d'électrolyte solide et batterie entièrement solide Download PDF

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EP4167319A1
EP4167319A1 EP21822208.1A EP21822208A EP4167319A1 EP 4167319 A1 EP4167319 A1 EP 4167319A1 EP 21822208 A EP21822208 A EP 21822208A EP 4167319 A1 EP4167319 A1 EP 4167319A1
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Prior art keywords
solid electrolyte
compound
group
lithium
electrode active
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EP21822208.1A
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German (de)
English (en)
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EP4167319A4 (fr
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Ryosuke SEI
Kunchan Lee
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Resonac Corp
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Showa Denko KK
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    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
    • H01M10/0562—Solid materials
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    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
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    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/45—Phosphates containing plural metal, or metal and ammonium
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    • C01B35/00—Boron; Compounds thereof
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    • C01B35/10—Compounds containing boron and oxygen
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    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
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    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0065—Solid electrolytes
    • H01M2300/0068—Solid electrolytes inorganic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • One embodiment of the present invention relates to a solid electrolyte material, a solid electrolyte, a method for producing the solid electrolyte, or an all-solid-state battery.
  • an inorganic solid electrolyte As the solid electrolyte, an inorganic solid electrolyte has attracted attention, and as the inorganic solid electrolyte, oxide and sulfide solid electrolytes are mainly known.
  • Non Patent Literature 1 discloses that as such an oxide solid electrolyte, LiTa 2 PO 8 , which has a monoclinic crystal structure, exhibits a high lithium ion conductivity (total conductivity (25°C) : 2.5 ⁇ 10 -4 S ⁇ cm -1 ).
  • Non Patent Literature 1 J. Kim et al., J. Mater. Chem. A, 2018, 6, p22478-22482
  • An oxide solid electrolyte has an extremely high grain boundary resistance, and in order to obtain an ion conductivity that allows use thereof in an all-solid-state battery, a powder of the solid electrolyte needs to be not only compression molded, but also formed into a high density sintered body. Then, in order to obtain such a high density sintered body, the solid electrolyte needs to be fired at a high temperature of, for example, about 1100°C.
  • the solid electrolyte needs to be sintered together with, for example, a positive electrode material and a negative electrode material.
  • One embodiment of the present invention provides a solid electrolyte material that can allow a sintered body having a sufficient ion conductivity to be obtained even when fired at a low temperature (e.g., 900°C or less).
  • the solid electrolyte material it is possible to easily manufacture an all-solid-state battery including a solid electrolyte having a sufficient ion conductivity while having excellent economic efficiency and suppressing, for example, decomposition, and alteration in quality of another material such as a positive electrode or negative electrode material.
  • the solid electrolyte material according to one embodiment of the present invention (hereinafter, also referred to as “the present material”) is amorphous, and includes lithium, tantalum, phosphorus, and oxygen as constituent elements and has a content of the phosphorus element of more than 5.3 atomic % and less than 8.3 atomic %.
  • the present material is amorphous.
  • XRD X-ray diffraction
  • the solid electrolyte obtained from the present material particularly the solid electrolyte (sintered body) obtained by firing the present material, tends to exhibit a higher ion conductivity.
  • the shape, and size of the present material are not particularly limited, and the present material is preferably in the form of a particle (powder), and the average particle size (D50) of the present material is preferably 0.1 to 10 ⁇ m and more preferably 0.1 to 5 ⁇ m.
  • the solid electrolyte obtained from the present material particularly the solid electrolyte (sintered body) obtained by firing the present material, tends to exhibit a higher ion conductivity.
  • the elements constituting the present material are not particularly limited as long as the present material includes lithium, tantalum, phosphorus, and oxygen, and the present material may include one or more elements selected from the group consisting of B, Bi, Nb, Zr, Ga, Sn, Hf, W, Mo, Si, Al, and Ge.
  • the content of the lithium element in the present material is preferably 5.0 to 20.0 atomic % and more preferably 9.0 to 15.0 atomic %, from the viewpoint of, for example, being able to easily obtain a solid electrolyte having a higher lithium ion conductivity.
  • the content of each element in the present material can be measured, for example, by the absolute intensity quantification method of Auger electron spectroscopy (AES) using a standard powder sample containing Mn, Co, and Ni in a proportion of 1:1:1 as a lithium-containing transition metal oxide such as LiCoO 2 .
  • AES Auger electron spectroscopy
  • the content thereof can be determined by a conventionally known quantitative analysis.
  • the content of each element in the present material can be determined using a high frequency inductively coupled plasma (ICP) emission spectrometer after adding an acid to a sample for thermal decomposition and then adjusting the volume of the thermal decomposition product.
  • ICP inductively coupled plasma
  • the content of the tantalum element in the present material is preferably 10.6 to 16.6 atomic % and more preferably 11.0 to 16.0 atomic %, from the viewpoint of, for example, being able to easily obtain a solid electrolyte having a higher lithium ion conductivity.
  • the content of the phosphorus element in the present material is more than 5.3 atomic% and less than 8.3 atomic%, preferably 5.5 atomic% or more and less than 8.3 atomic%, more preferably 5.5 atomic% or more and 8.2 atomic% or less, and further preferably 5.7 atomic% or more and 8.2 atomic% or less, from the viewpoint of, for example, being able to further lower the firing temperature when obtaining a sintered body having a sufficient ion conductivity.
  • the present material includes one or more elements selected from the group consisting of B, Bi, Nb, Zr, Ga, Sn, Hf, W, Mo, Si, Al, and Ge
  • the content of each of one or more elements selected from the group consisting of B, Bi, Nb, Zr, Ga, Sn, Hf, W, Mo, Si, Al, and Ge in the present material is preferably 0.1 to 5.0 atomic % and more preferably 0.1 to 3.0 atomic %, from the viewpoint that for example, it tends to be able to easily obtain a solid electrolyte exhibiting a higher ion conductivity.
  • the present material is preferably produced as a component (Z) including lithium, tantalum, phosphorus, and oxygen as constituent elements, for example, by a method (I) including a pulverization step of pulverizing (pulverizing and mixing) a material to be pulverized including lithium, tantalum, phosphorus, and oxygen as constituent elements.
  • pulverization is carried out such that the present material obtained is made amorphous by a mechanochemical reaction.
  • pulverization is preferably carried out such that the average particle size of the present material is within the above range.
  • Examples of the pulverization step include a pulverizing method using, for example, a roll tumbling mill, a ball mill, a small diameter ball mill (bead mill), a medium stirring mill, an air flow pulverizer, a mortar, an automatic kneading mortar, a tank crusher, or a jet mill.
  • a pulverizing method using a ball mill or a bead mill is preferable, and a pulverizing method using a ball mill using a ball having a diameter of 0.1 to 10 mm is more preferable, from the viewpoint of, for example, being able to easily obtain a solid electrolyte exhibiting a higher ion conductivity when a solid electrolyte is obtained from the present material.
  • the time of the pulverization step is preferably 0.5 to 48 hours and more preferably 2 to 48 hours, from the viewpoint of, for example, being able to easily obtain the present material that is made amorphous by a mechanochemical reaction and has an average particle size (D50) in the above range.
  • the mixing may be carried out while the pulverization is carried out while carrying out heating if necessary, and the pulverization step is usually carried out at room temperature.
  • the pulverization step may be carried out in the atmosphere, and is preferably carried out in an atmosphere of nitrogen gas and/or argon gas in which the oxygen gas content is adjusted in the range of 0 to 20% by volume.
  • the raw material used for the material to be pulverized is preferably an inorganic compound from the viewpoint of ease of handling.
  • the raw material may be produced and obtained by a conventionally known method, or a commercially available product may be used as the raw material.
  • Examples of the method (I) include a method (i) using a compound including a lithium atom, a compound including a tantalum atom, and a compound including a phosphorus atom, as the material to be pulverized.
  • Examples of the compound including a lithium atom include lithium carbonate (Li 2 CO 3 ), lithium oxide (Li 2 O), lithium hydroxide (LiOH), lithium acetate (LiCH 3 COO), and hydrates thereof.
  • lithium carbonate, lithium hydroxide, and lithium acetate are preferable in that these are easily decomposed and reacted.
  • the compound including a lithium atom one may be used, or two or more may be used.
  • Examples of the compound including a tantalum atom include tantalum pentoxide (Ta 2 O 5 ) and tantalum nitrate (Ta(NO 3 ) 5 ). Among these, tantalum pentoxide is preferable from the viewpoint of cost.
  • the compound including a tantalum atom one may be used, or two or more may be used.
  • a phosphate As the compound including a phosphorus atom, a phosphate is preferable, and examples of the phosphate include diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) and monoammonium dihydrogen phosphate (NH 4 H 2 PO 4 ) in that these are easily decomposed and reacted.
  • diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 )
  • monoammonium dihydrogen phosphate NH 4 H 2 PO 4
  • the compound including a phosphorus atom one may be used, or two or more may be used.
  • the present material includes one or more elements M1 selected from the group consisting of Bi, Nb, Zr, Ga, Sn, Hf, W, and Mo, and/or when the present material includes one or more elements M2 selected from the group consisting of B, Si, Al and Ge, there is a method (i') using a compound including a lithium atom, a compound including a tantalum atom, a compound including a phosphorus atom, and further a compound including the elements M1 and/or a compound including the elements M2 as the material to be pulverized.
  • the compound including the elements M1 is not particularly limited, and an inorganic compound is preferable from the viewpoint of ease of handling, and examples thereof include an oxide and a nitrate of M1. Among these, an oxide is preferable from the viewpoint of cost.
  • the compound including M1 one may be used, or two or more may be used.
  • examples of the compound including a niobium atom include Nb 2 O 5 , LiNbO 3 , LiNb 3 O 8 , and NbPO 5 .
  • the compound including a niobium atom one may be used, or two or more may be used.
  • examples of the compound including a bismuth atom include LiBiO 2 , Li 3 BiO 3 , Li 4 Bi 2 O 5 , Li 2.4 Al 0.2 BiO 3 , and Bi 2 O 3 .
  • the compound including a bismuth atom one may be used, or two or more may be used.
  • examples of the oxide thereof include gallium oxide (Ga 2 O 3 ) and tin oxide (SnO 2 ), respectively.
  • examples of the oxide thereof include zirconium oxide (ZrO 2 ), hafnium oxide (HfO 2 ), tungsten oxide (WO 3 ), and molybdenum oxide (MoO 3 ), respectively.
  • zirconium hydroxide (Zr(OH) 4 ), hafnium hydroxide (Hf(OH) 4 ), tungstic acid (H 2 WO 4 ), and molybdic acid (H 2 MoO 4 ) can also be used from the viewpoint of ease of reaction.
  • the compound including the elements M2 is not particularly limited, and an inorganic compound is preferable from the viewpoint of ease of handling, and examples thereof include an oxide of M2.
  • the compound including the elements M2 one may be used, or two or more may be used.
  • examples of the compound including a boron atom include LiBO 2 , LiB 3 O 5 , Li 2 B 4 O 7 , Li 3 B 11 O 18 , Li 3 BO 3 , Li 3 B 7 O 12 , Li 4 B 2 O 5 , Li 6 B 4 O 9 , Li 3-x5 B 1-x5 C x5 O 3 (0 ⁇ x ⁇ 1), Li 4-x6 B 2-x6 C x6 O 5 (0 ⁇ x6 ⁇ 2), Li 2.4 Al 0.2 BO 3 , Li 2.7 Al 0.1 BO 3 , B 2 O 3 , and H 3 BO 3 .
  • the compound including a boron atom one may be used, or two or more may be used.
  • examples of the compound including a silicon atom include SiO 3 , Li 2 SiO 3 , Li 2 Si 2 O 5 , Li 2 Si 3 O 7 , Li 4 SiO 4 , Li 6 Si 2 O 7 , and Li 8 SiO 6 .
  • the compound including a silicon atom one may be used, or two or more may be used.
  • M2 is Ge or Al
  • examples of the oxide thereof include germanium oxide (GeO 2 ) and aluminum oxide (Al 2 O 3 ), respectively.
  • these may be mixed, for example, in amounts such that the content of each constituent element in the present material obtained is in the above range.
  • a lithium atom is likely to flow out of the system, and thus the compound including a lithium atom may be excessively used by about 10 to 20%.
  • the compound including a phosphorus atom may be excessively used by about 1 to 10%.
  • each raw material may be mixed in advance before the pulverization step, and each raw material is preferably mixed while pulverized (pulverized and mixed) in the pulverization step.
  • examples of the method (I) also include a method (ii) using a compound (a) including lithium, tantalum, phosphorus, and oxygen as constituent elements and a phosphorus compound (b) (hereinafter, also simply referred to as the compound (b)) as the material to be pulverized, or a method (iii) using a compound (c) including lithium, tantalum, phosphorus, and oxygen as constituent elements as the material to be pulverized [wherein the compound (c) is a compound having a content of the phosphorus element in the above range].
  • a compound including the elements M1 and/or a compound including the elements M2 may be further used.
  • the compound (a) and the compound (b) may be mixed in advance before the pulverization step, and the compound (a) and the compound (b) are preferably mixed while pulverized (pulverized and mixed) in the pulverization step.
  • the compound (a) is a compound including lithium, tantalum, phosphorus, and oxygen as constituent elements, is preferably an oxide including these elements, and is more preferably a lithium ion conductive compound including these elements.
  • the compound (a) may be the same compound as the compound (c), and the content of the phosphorus element of the compound (a) may be lower than the lower limit of the above range.
  • the compound (a) used in the method (ii) one may be used, or two or more may be used.
  • the compound (a) is preferably a compound having a monoclinic structure. Whether the compound (a) has a monoclinic structure can be determined, for example, by Rietveld analysis of an X-ray diffraction (XRD) pattern of the compound (a), specifically by the method of the following Examples.
  • XRD X-ray diffraction
  • the compound (a) include a compound (a1) that includes lithium, tantalum, phosphorus, and oxygen as constituent elements, and may further include one or more elements M1 selected from the group consisting of Bi, Nb, Zr, Ga, Sn, Hf, W, and Mo, and a compound (a2) that includes lithium, tantalum, phosphorus, and oxygen as constituent elements, and may further include one or more elements M2 selected from the group consisting of B, Si, Al and Ge.
  • the compound (a) is preferably a compound consisting only of lithium, tantalum, phosphorus, and oxygen as constituent elements, and more preferably LiTa 2 PO 8 , from the viewpoint of, for example, exerting the advantageous effects of the present invention more.
  • the compound (a1) is preferably LiTa 2 PO 8 or a compound obtained by replacing a part of Ta of LiTa 2 PO 8 with the element(s) M1, and preferably has a monoclinic structure.
  • the compound (a1) is specifically preferably a compound represented by the composition formula Li[ 1+(5-a)x ]Ta 2-x M1 x PO 8 [where M1 is one or more elements selected from the group consisting of Bi, Nb, Zr, Ga, Sn, Hf, W, and Mo, 0.0 ⁇ x ⁇ 1.0, and a is an average valence of M1].
  • Bi, Nb, W, and Mo are more preferable, Bi, Nb, and W are further preferable, and Bi and Nb are particularly preferable as M1, from the viewpoint of, for example, increasing the lithium ion conductivity at a crystal grain boundary in the solid electrolyte obtained by using the compound (a).
  • the x is preferably 0.95 or less, more preferably 0.90 or less, further preferably 0.85 or less, more preferably 0.80 or less, and particularly preferably 0.75 or less.
  • the amount of Li varies according to the average valence of M1 such that the charge neutrality of the compound (a) described above can be obtained.
  • the average valence represented by the a can be determined as follows.
  • the compound (a2) is preferably LiTa 2 PO 8 or a compound obtained by replacing a part of P of LiTa 2 PO 8 with the element(s) M2, and preferably has a monoclinic structure.
  • the compound (a2) is specifically preferably a compound represented by the composition formula Li[ 1+(5-b)y] Ta 2 P 1-y M2 y O 8 [where M2 is one or more elements selected from the group consisting of B, Si, Al and Ge, 0.0 ⁇ y ⁇ 0.7, and b is an average valence of M2].
  • B, Si, and Al are more preferable, and B and Si are further preferable as M2, from the viewpoint of, for example, increasing the lithium ion conductivity at a crystal grain boundary in the solid electrolyte obtained by using the compound (a).
  • the y is preferably 0.65 or less, more preferably 0.60 or less, and further preferably 0.55 or less.
  • the total ion conductivity which is the sum of the lithium ion conductivity within a crystal grain and the lithium ion conductivity at a crystal grain boundary, tends to be high in the solid electrolyte obtained by using the compound (a).
  • the average valence represented by the b can be determined in the same manner as in the method for calculating the average valence a described above.
  • the method for producing the compound (a) is not particularly limited, and for example, a conventionally known production method such as a solid phase reaction or a liquid phase reaction can be adopted.
  • Specific examples of the method for producing the compound (a) include a method including at least a mixing step and a firing step each in one stage.
  • Examples of the mixing step in the method for producing the compound (a) include a step of mixing a compound including a lithium atom (e.g., an oxide or a carbonate), a compound including a tantalum atom (e.g., an oxide or a nitrate), a compound including a phosphorus atom (e.g., an ammonium salt), and, if necessary, a compound including the elements M1 (e.g., an oxide) and/or a compound including the elements M2 (e.g., an oxide), which are raw materials.
  • a compound including a lithium atom e.g., an oxide or a carbonate
  • a compound including a tantalum atom e.g., an oxide or a nitrate
  • a compound including a phosphorus atom e.g., an ammonium salt
  • each of the raw materials one may be used, or two or more may be used.
  • Examples of the method for mixing the raw materials include a mixing method using, for example, a roll tumbling mill, a ball mill, a small diameter ball mill (bead mill), a medium stirring mill, an air flow pulverizer, a mortar, an automatic kneading mortar, a tank crusher, or a jet mill.
  • these may be mixed, for example, at a stoichiometric ratio so as to obtain a desired composition of the compound (a).
  • the compound including a lithium atom is likely to flow out of the system, and thus the compound including a lithium atom may be excessively used by about 10 to 20%.
  • the compound including a phosphorus atom in order to suppress the generation of a by-product, may be excessively used by about 1 to 10%.
  • the mixing may be carried out while carrying out heating if necessary, and the mixing is usually carried out at room temperature.
  • the mixing may be carried out in the atmosphere, and is preferably carried out in an atmosphere of nitrogen gas and/or argon gas in which the oxygen gas content is adjusted in the range of 0 to 20% by volume.
  • the firing step in the method for producing the compound (a) the mixture obtained in the mixing step is fired.
  • a pulverization step using, for example, a ball mill, or a mortar may be provided for the purpose of pulverizing or reducing the particle size of the fired product obtained in the firing step.
  • the compound (a) has a low reaction rate of phase formation, and thus a reaction intermediate may be present in the first firing. In this case, it is preferable to carry out the first firing, carry out the pulverization step, and then further carry out the firing step.
  • the firing step may be carried out in the atmosphere, and is preferably carried out in an atmosphere of nitrogen gas and/or argon gas in which the oxygen gas content is adjusted in the range of 0 to 20% by volume.
  • the firing temperature depends on the firing time, and is preferably 800 to 1200°C, more preferably 950 to 1100°C, and further preferably 950 to 1000°C.
  • the firing time (the total firing time when the firing step is carried out several times) depends on the firing temperature, and is preferably 1 to 16 hours and more preferably 3 to 12 hours.
  • the fired product obtained after the firing step may absorb moisture or react with carbon dioxide to alter in quality. Because of this, the fired product obtained after the firing step is preferably transferred into a dehumidified inert gas atmosphere and stored when the temperature thereof drops to 200°C or less in temperature lowering after the firing step.
  • the phosphorus compound (b) is a compound different from the compound (a).
  • the compound (b) used in the method (ii) one may be used, or two or more may be used.
  • the compound (b) is preferably an inorganic compound from the viewpoint of ease of handling.
  • the compound (b) may be produced and obtained by a conventionally known method, or a commercially available product may be used as the compound (b).
  • the compound (b) is preferably a crystalline compound. Whether the compound (b) is a crystalline compound can be determined, for example, from an X-ray diffraction (XRD) pattern of the compound (b).
  • XRD X-ray diffraction
  • a phosphate is preferable, and examples of the phosphate include diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) and monoammonium dihydrogen phosphate (NH 4 H 2 PO 4 ) in that these are easily decomposed and reacted.
  • examples of the phosphorus compound that may be used include LiPO 3 and Li 3 PO 4 .
  • the compound (a) and the compound (b) in amounts such that the content of each constituent element in the present material obtained is in the above range.
  • the compound (c) is a compound including lithium, tantalum, phosphorus, and oxygen as constituent elements, is preferably an oxide including these elements, and is more preferably a lithium ion conductive compound including these elements.
  • the compound (c) is a compound having a content of the phosphorus element in the above range.
  • the compound (c) is preferably a compound having a monoclinic structure. Whether the compound (c) has a monoclinic structure can be determined, for example, by Rietveld analysis of an X-ray diffraction (XRD) pattern of the compound (c), specifically by the method of the following Examples.
  • XRD X-ray diffraction
  • the method for producing the compound (c) is not particularly limited, and examples thereof include the same production method as for the compound (a).
  • the fired product is preferably transferred into a dehumidified inert gas atmosphere and stored as when producing the compound (a).
  • the solid electrolyte according to one embodiment of the present invention (hereinafter, also referred to as "the present electrolyte”) is obtained by using the present material and is preferably a sintered body of the present material obtained by firing the present material.
  • the present electrolyte preferably has a monoclinic structure. Whether the solid electrolyte has a monoclinic structure can be determined, for example, by Rietveld analysis of an X-ray diffraction (XRD) pattern of the solid electrolyte, specifically by the method of the following Examples.
  • XRD X-ray diffraction
  • the present electrolyte tends to be a solid electrolyte having a high ion conductivity both within a crystal grain and at a grain boundary.
  • the total ion conductivity of the sintered body of the present material obtained by firing the present material at 850°C or more and 900°C or less is preferably 2.00 ⁇ 10 -4 S ⁇ cm -1 or more and more preferably 3.00 ⁇ 10 -4 S ⁇ cm -1 or more.
  • the total ion conductivity of the sintered body of the present material obtained by firing the present material at 750°C or more and less than 850°C is preferably 4.00 ⁇ 10 -5 S ⁇ cm -1 or more and more preferably 8.00 ⁇ 10 -5 S ⁇ cm -1 or more.
  • the total ion conductivity of the sintered body of the present material obtained by firing the present material at 700°C or more and less than 750°C is preferably 2.00 ⁇ 10 -5 S ⁇ cm -1 or more and more preferably 4.00 ⁇ 10 -5 S ⁇ cm -1 or more.
  • the total ion conductivity of the sintered body of the present material obtained by firing the present material at 650°C or more and less than 700°C is preferably 1.00 ⁇ 10 -5 S ⁇ cm -1 or more and more preferably 2.00 ⁇ 10 -5 S ⁇ cm -1 or more.
  • the sintered body obtained by firing the present material at a low temperature has a sufficient ion conductivity.
  • the total ion conductivity can be measured by the method described in the following Examples.
  • the method for producing the present electrolyte preferably includes a step A of firing the present material, and is more preferably a method for molding the present material and then firing the resulting material to obtain a sintered body.
  • the firing temperature in the step A is preferably 500 to 900°C, more preferably 600 to 850°C, and further preferably 650 to 850°C.
  • the firing time in the step A depends on the firing temperature, and is preferably 12 to 144 hours and more preferably 48 to 96 hours.
  • the firing in the step A may be carried out in the atmosphere, and is preferably carried out in an atmosphere of nitrogen gas and/or argon gas in which the oxygen gas content is adjusted in the range of 0 to 20% by volume.
  • the firing in the step A may be carried out in a reducing gas atmosphere such as a nitrogen-hydrogen mixed gas including a reducing gas such as hydrogen gas.
  • a reducing gas atmosphere such as a nitrogen-hydrogen mixed gas including a reducing gas such as hydrogen gas.
  • the ratio of hydrogen gas included in the nitrogen-hydrogen mixed gas is, for example, 1 to 10% by volume.
  • the reducing gas other than hydrogen gas for example, ammonia gas, or carbon monoxide gas may be used.
  • step A it is preferable to fire a molded body obtained by molding the present material and it is more preferable to fire a molded body obtained by press molding the present material, from the viewpoint of, for example, being able to easily obtain a solid electrolyte (sintered body) having a higher ion conductivity.
  • the pressure when press molding the present material is not particularly limited, and is preferably 50 to 500 MPa and more preferably 100 to 400 MPa.
  • the shape of the molded body obtained by press molding the present material is not particularly limited, either, and is preferably a shape dependent on the intended use of the sintered body (solid electrolyte) obtained by firing the molded body.
  • a lithium ion conductive compound When producing the present electrolyte, other components other than the present material may be used.
  • the other components include a conventionally known material used for a solid electrolyte of an all-solid-state battery, and examples of, for example, a lithium ion conductive compound include a lithium ion conductive material having a structure such as NASICON type one or LISICON type one.
  • the amount of the other components used is preferably 50% by mass or less and more preferably 30% by mass or less per 100% by mass in total of the other components and the present material, and the other components are preferably not used.
  • the all-solid-state battery according to one embodiment of the present invention (hereinafter, also referred to as "the present battery”) includes a positive electrode having a positive electrode active material, a negative electrode having a negative electrode active material, and a solid electrolyte layer between the positive electrode and the negative electrode, wherein the solid electrolyte layer includes the present electrolyte.
  • the present battery may be a primary battery or a secondary battery, and is preferably a secondary battery and more preferably a lithium ion secondary battery, from the viewpoint of, for example, exerting the advantageous effects of the present invention more.
  • the structure of the present battery is not particularly limited as long as the present battery include a positive electrode, a negative electrode, and a solid electrolyte layer between the positive electrode and the negative electrode, and may be a so-called thin film type, laminated type, or bulk type.
  • the solid electrolyte layer is not particularly limited as long as the solid electrolyte layer includes the present electrolyte, and if necessary, may include a conventionally known additive used for the solid electrolyte layer of the all-solid-state battery, and the solid electrolyte layer preferably consists of the present electrolyte.
  • the thickness of the solid electrolyte layer may be appropriately selected according to the structure (for example thin film type) of the battery to be formed, and is preferably 50 nm to 1000 ⁇ m and more preferably 100 nm to 100 pm.
  • the positive electrode is not particularly limited as long as the positive electrode has a positive electrode active material, and preferable examples thereof include a positive electrode having a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is not particularly limited as long as the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material layer preferably includes a positive electrode active material and a solid electrolyte and may further include an additive such as an electrically conductive aid or a sintering aid.
  • the thickness of the positive electrode active material layer may be appropriately selected according to the structure (for example thin film type) of the battery to be formed, and is preferably 10 to 200 pm, more preferably 30 to 150 pm, and further preferably 50 to 100 pm.
  • the positive electrode active material examples include LiCo oxide, LiNiCo oxide, LiNiCoMn oxide, LiNiMn oxide, LiMn oxide, LiMn spinel, LiMnNi oxide, LiMnAl oxide, LiMnMg oxide, LiMnCo oxide, LiMnFe oxide, LiMnZn oxide, LiCrNiMn oxide, LiCrMn oxide, lithium titanate, metal lithium phosphate, a transition metal oxide, titanium sulfide, graphite, hard carbon, a transition metal-containing lithium nitride, silicon oxide, lithium silicate, lithium metal, a lithium alloy, a Li-containing solid solution, and a lithium-storing intermetallic compound.
  • LiNiCoMn oxide, LiNiCo oxide, and LiCo oxide are preferable, and LiNiCoMn oxide is more preferable, from the viewpoint of, for example, having a good affinity with a solid electrolyte, having an excellent balance of macroscopic electrical conductivity, microscopic electrical conductivity, and ion conductivity, having a high average potential, and being able to increase the energy density or battery capacity in the balance between specific capacity and stability.
  • the surface of the positive electrode active material may be coated with, for example, an ion conductive oxide such as lithium niobate, lithium phosphate, or lithium borate.
  • an ion conductive oxide such as lithium niobate, lithium phosphate, or lithium borate.
  • the positive electrode active material used for the positive electrode active material layer one may be used or two or more may be used.
  • the positive electrode active material also include LiM3PO 4 [where M3 is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, Ti, and V, or two elements V and O], LiM5VO 4 [where M5 is one or more elements selected from the group consisting of Fe, Mn, Co, Ni, Al, and Ti], Li 2 M6P 2 O 7 [where M6 is one or more elements selected from the group consisting of Fe, Mn, Co, Ni, Al, Ti, and V, or two elements V and OJ, LiVP 2 O 7 , Li x7 V y7 M7 z7 [where 2 ⁇ x7 ⁇ 4, 1 ⁇ y7 ⁇ 3, 0 ⁇ z7 ⁇ 1, 1 ⁇ y7 + z7 ⁇ 3, and M7 is one or more elements selected from the group consisting of Ti, Ge, Al, Ga, and Zr], Li 1+x8 Al x8 M8 2- x8 (PO 4 ) 3 [where 0
  • the positive electrode active material is preferably in the form of a particle.
  • the 50% diameter in the volume-based particle size distribution thereof is preferably 0.1 to 30 pm, more preferably 0.3 to 20 pm, further preferably 0.4 to 10 pm, and particularly preferably 0.5 to 3 ⁇ m.
  • the ratio of the length of the major axis to the length of the minor axis is preferably less than 3 and more preferably less than 2.
  • the positive electrode active material may form a secondary particle.
  • the 50% diameter in the number-based particle size distribution of the primary particle is preferably 0.1 to 20 pm, more preferably 0.3 to 15 pm, further preferably 0.4 to 10 pm, and particularly preferably 0.5 to 2 pm.
  • the content of the positive electrode active material in the positive electrode active material layer is preferably 20 to 80% by volume and more preferably 30 to 70% by volume.
  • the positive electrode active material When the content of the positive electrode active material is in the above range, the positive electrode active material functions favorably, and a battery having a high energy density tends to be able to be easily obtained.
  • the solid electrolyte that can be used for the positive electrode active material layer is not particularly limited, and a conventionally known solid electrolyte can be used, and the present electrolyte is preferably used from the viewpoint of, for example, exerting the advantageous effects of the present invention more.
  • solid electrolyte used for the positive electrode active material layer one may be used or two or more may be used.
  • the electrically conductive aid include a metal material such as Ag, Au, Pd, Pt, Cu, or Sn, and a carbon material such as acetylene black, ketjen black, a carbon nanotube, or a carbon nanofiber.
  • the compound (b) a compound including a boron atom, a compound including a niobium atom, a compound including a bismuth atom, and a compound including a silicon atom are preferable.
  • each additive used for the positive electrode active material layer one may be used or two or more may be used.
  • the positive electrode current collector is not particularly limited as long as the material thereof is one that conducts an electron without causing an electrochemical reaction.
  • Examples of the material of the positive electrode current collector include a simple substance of a metal such as copper, aluminum, or iron, an alloy including any of these metals, and an electrically conductive metal oxide such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO).
  • a current collector obtained by providing an electrically conductive adhesive layer on the surface of an electric conductor can also be used.
  • the electrically conductive adhesive layer include a layer including, for example, a granular electrically conductive material, or a fibrous electrically conductive material.
  • the negative electrode is not particularly limited as long as the negative electrode has a negative electrode active material, and preferable examples thereof include a negative electrode having a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is not particularly limited as long as the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material layer preferably includes a negative electrode active material and a solid electrolyte and may further include an additive such as an electrically conductive aid or a sintering aid.
  • the thickness of the negative electrode active material layer may be appropriately selected according to the structure (for example thin film type) of the battery to be formed, and is preferably 10 to 200 pm, more preferably 30 to 150 pm, and further preferably 50 to 100 pm.
  • Examples of the negative electrode active material include a lithium alloy, a metal oxide, graphite, hard carbon, soft carbon, silicon, a silicon alloy, silicon oxide SiO n (0 ⁇ n ⁇ 2), a silicon/carbon composite material, a composite material including a silicon domain within a pore of porous carbon, lithium titanate, and graphite coated with lithium titanate.
  • a silicon/carbon composite material and a composite material including a silicon domain in a pore of porous carbon are preferable because these have a high specific capacity and can increase the energy density and the battery capacity.
  • a composite material including a silicon domain in a pore of porous carbon is more preferable, has excellent alleviation of volume expansion associated with lithium storage/release by silicon, and can maintain the balance of macroscopic electrical conductivity, microscopic electrical conductivity, and ion conductivity well.
  • a composite material including a silicon domain in a pore of porous carbon in which the silicon domain is amorphous, the size of the silicon domain is 10 nm or less, and the pore derived from the porous carbon is present in the vicinity of the silicon domain is particularly preferable.
  • the negative electrode active material also include LiM3PO 4 [where M3 is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, Ti, and V, or two elements V and O], LiM5VO 4 [where M5 is one or more elements selected from the group consisting of Fe, Mn, Co, Ni, Al, and Ti], Li 2 M6P 2 O 7 [where M6 is one or more elements selected from the group consisting of Fe, Mn, Co, Ni, Al, Ti, and V, or two elements V and OJ, LiVP 2 O 7 , Li x7 V y7 M7 z7 [where 2 ⁇ x7 ⁇ 4, 1 ⁇ y7 ⁇ 3, 0 ⁇ z7 ⁇ 1, 1 ⁇ y7 + z7 ⁇ 3, and M7 is one or more elements selected from the group consisting of Ti, Ge, Al, Ga, and Zr], Li 1+x8 Al x8 M8 2-x8 (PO 4 ) 3 [where 0 ⁇
  • the negative electrode active material is preferably in the form of a particle.
  • the 50% diameter in the volume-based particle size distribution thereof, the aspect ratio, and the 50% diameter in the number-based particle size distribution of a primary particle when the negative electrode active material forms a secondary particle are preferably in the same ranges as for the positive electrode active material.
  • the content of the negative electrode active material in the negative electrode active material layer is preferably 20 to 80% by volume and more preferably 30 to 70% by volume.
  • the negative electrode active material When the content of the negative electrode active material is in the above range, the negative electrode active material functions favorably, and a battery having a high energy density tends to be able to be easily obtained.
  • the solid electrolyte that can be used for the negative electrode active material layer is not particularly limited, and a conventionally known solid electrolyte can be used, and the present electrolyte is preferably used from the viewpoint of, for example, exerting the advantageous effects of the present invention more.
  • solid electrolyte used for the negative electrode active material layer one may be used or two or more may be used.
  • the electrically conductive aid include a metal material such as Ag, Au, Pd, Pt, Cu, or Sn, and a carbon material such as acetylene black, ketjen black, a carbon nanotube, or a carbon nanofiber.
  • the compound (b) a compound including a boron atom, a compound including a niobium atom, a compound including a bismuth atom, and a compound including a silicon atom are preferable.
  • each additive used for the negative electrode active material layer one may be used or two or more may be used.
  • the same current collector as for the positive electrode current collector can be used.
  • the all-solid-state battery can be formed, for example, by a known powder molding method.
  • the positive electrode current collector, a powder for the positive electrode active material layer, a powder for the solid electrolyte layer, a powder for the negative electrode active material layer, and the negative electrode current collector are stacked in this order, these are powder molded at the same time, and thereby formation of each layer of the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer, and connection between any adjacent two of the positive electrode current collector, the positive electrode active material layer, the solid electrolyte layer, the negative electrode active material layer, and the negative electrode current collector can be carried out at the same time.
  • an all-solid-state battery exhibiting a sufficient ion conductivity can be obtained, and thus it is possible to manufacture an all-solid-state battery with excellent economic efficiency and equipment saving while suppressing, for example, decomposition, and alteration in quality of another material such as a positive electrode or negative electrode material.
  • Each layer of the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer may be powder molded, and when an all-solid-state battery is manufactured using each of the obtained layers, each of the layers is preferably pressed to carry out firing.
  • the all-solid-state battery can also be manufactured, for example, by the following method.
  • a solvent, and/or a resin are(is) appropriately mixed into a material for positive electrode active material layer formation, a material for solid electrolyte layer formation, and a material for negative electrode active material layer formation to prepare pastes for formation of the layers, respectively, and the pastes are applied onto base sheets, respectively, and dried to manufacture a green sheet for the positive electrode active material layer, a green sheet for the solid electrolyte layer, and a green sheet for the negative electrode active material layer.
  • the green sheet for the positive electrode active material layer, the green sheet for the solid electrolyte layer, and the green sheet for the negative electrode active material layer from each of which the base sheet is peeled off are sequentially laminated, thermocompression bonded at a predetermined pressure, and then enclosed in a container and pressurized by, for example, hot isostatic pressing, cold isostatic pressing, or isostatic pressing to manufacture a laminated structure.
  • the laminated structure is subjected to degreasing treatment at a predetermined temperature and then to firing treatment to manufacture a laminated sintered body.
  • the firing temperature in this firing treatment is preferably the same as the firing temperature in the step A.
  • an all-solid-state battery can also be manufactured by forming a positive electrode current collector and a negative electrode current collector on both principal surfaces of the laminated sintered body by, for example, a sputtering method, a vacuum vapor deposition method, or application or dipping of a metal paste.
  • Lithium hydroxide monohydrate LiOH•H 2 O
  • boric acid H 3 BO 3
  • the raw material powders thereof weighed were pulverized and mixed in an agate mortar for 15 minutes to obtain a mixture.
  • the obtained mixture was placed in an alumina boat, and the temperature thereof was raised to 500°C under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the mixture was fired at 500°C for 2 hours to obtain a primary fired product.
  • the obtained primary fired product was pulverized and mixed in an agate mortar for 15 minutes, the obtained mixture was placed in an alumina boat, and the temperature thereof was raised to 630°C under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the mixture was fired at 630°C for 24 hours to obtain a secondary fired product (Li 3 BO 3 ).
  • the temperature of the obtained secondary fired product was lowered to room temperature, then taken out from the rotary firing furnace, transferred into a dehumidified nitrogen gas atmosphere, and stored.
  • a secondary fired product (Li 4 B 2 O 5 ) was obtained by manufacturing in the same manner as in Synthesis Example 1 except that lithium hydroxide monohydrate (LiOH•H 2 O) (manufactured by FUJIFILM Wako Pure Chemical Corporation, purity of 98.0% or more) and boric acid (H 3 BO 3 ) (manufactured by FUJIFILM Wako Pure Chemical Corporation, purity of 99.5% or more) were weighed such that the ratio of the numbers of atoms of lithium and boron (Li:B) was 2.00:1.00.
  • Lithium hydroxide monohydrate LiOH•H 2 O
  • bismuth oxide manufactured by FUJIFILM Wako Pure Chemical Corporation, purity of 99.9%
  • the obtained mixture was placed in an alumina boat, and the temperature thereof was raised to 600°C under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the mixture was fired at 600°C for 4 hours to obtain a fired product (LiBiO 2 ).
  • the temperature of the obtained fired product was lowered to room temperature, then taken out from the rotary firing furnace, transferred into a dehumidified nitrogen gas atmosphere, and stored.
  • tantalum pentoxide Ti 2 O 5
  • pulverization was carried out for 2 hours using a zirconia ball mill (zirconia ball: diameter of 3 mm).
  • lithium carbonate Li 2 CO 3
  • the pulverized tantalum pentoxide Ti 2 O 5
  • Li 3 BO 3 obtained in Synthesis Example 1 described above
  • diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 ) (manufactured by Sigma-Aldrich, Inc., purity of 98% or more) were weighed such that the ratio of the numbers of atoms of lithium, tantalum, boron, and phosphorus (Li:Ta:B:P) was as shown in Table 1, and further, in order to suppress the generation of a by-product in the firing step, diammonium hydrogen phosphate was weighed in such a way as to provide an amount of 1.065 times the amount of phosphorus atoms in Table 1.
  • the obtained solid electrolyte material was evaluated by powder X-ray diffraction described later and found to be amorphous.
  • Amorphous solid electrolyte materials were obtained by manufacturing in the same manner as in Example 1 except that, the mixing ratios of the raw materials were changed such that the ratios of the numbers of atoms of lithium, tantalum, boron, and phosphorus were the amounts shown in Table 1.
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Example 1 except that in Example 1, silicon oxide (SiO 2 ) (manufactured by FUJIFILM Wako Pure Chemical Corporation, purity of 99.9%) was further used, and the mixing ratio of the raw materials was changed such that the ratio of the numbers of atoms of lithium, tantalum, boron, phosphorus, and silicon (Li:Ta:B:P:Si) was the amount shown in Table 1.
  • Amorphous solid electrolyte materials were obtained by manufacturing in the same manner as in Example 1 except that Li 4 B 2 O 5 obtained in Synthesis Example 2 described above was used instead of Li 3 BO 3 , and each raw material powder was used such that the ratios of the numbers of atoms of lithium, tantalum, boron, and phosphorus were as shown in Table 1.
  • Nb 2 O 5 niobium pentoxide
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Example 4 except that in Example 4, the pulverized niobium pentoxide (Nb 2 O 5 ) was further used, and each raw material powder was used such that the ratio of the numbers of atoms of lithium, tantalum, niobium, boron, and phosphorus was as shown in Table 1.
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Example 4 except that in Example 4, boric acid (H 3 BO 3 ) (manufactured by FUJIFILM Wako Pure Chemical Corporation, purity of 99.5% or more) was used instead of Li 4 B 2 O 5 , and each raw material powder was used such that the ratio of the numbers of atoms of lithium, tantalum, boron, and phosphorus was as shown in Table 1.
  • boric acid H 3 BO 3
  • FUJIFILM Wako Pure Chemical Corporation purity of 99.5% or more
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Example 1 except that in Example 1, silicon oxide (SiO 2 ) (manufactured by FUJIFILM Wako Pure Chemical Corporation, purity of 99.9%) was used instead of Li 3 BO 3 , and each raw material powder was used such that the ratio of the numbers of atoms of lithium, tantalum, phosphorus, and silicon (Li:Ta:P:Si) was as shown in Table 1.
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Example 1 except that in Example 1, LiBiO 2 obtained in Synthesis Example 3 was used instead of Li 3 BO 3 , and each raw material powder was used such that the ratio of the numbers of atoms of lithium, tantalum, bismuth, and phosphorus (Li:Ta:Bi:P) was as shown in Table 1.
  • Lithium carbonate Li 2 CO 3
  • tantalum pentoxide Ta 2 O 5
  • diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 )
  • the obtained mixture was placed in an alumina boat, and the temperature thereof was raised to 1000°C under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the mixture was fired at 1000°C for 4 hours to obtain a primary fired product.
  • the obtained primary fired product was pulverized and mixed in an agate mortar for 15 minutes, the obtained mixture was placed in an alumina boat, and the temperature thereof was raised to 1000°C under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the mixture was fired at 1000°C for 1 hour to obtain a secondary fired product.
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Comparative Example 1 except that the mixing ratio of the raw materials was changed such that the ratio of the numbers of atoms of lithium, tantalum, and phosphorus was the amount shown in Table 1.
  • An amorphous solid electrolyte material was obtained by manufacturing in the same manner as in Example 3 except that in Example 3, the mixing ratio of the raw materials was changed such that the ratio of the numbers of atoms of lithium, tantalum, boron, silicon, and phosphorus was the amount shown in Table 1.
  • Lithium carbonate Li 2 CO 3
  • tantalum pentoxide Ta 2 O 5
  • Li 4 B 2 O 5 Li 4 B 2 O 5 obtained in Synthesis Example 2 described above
  • diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) (manufactured by Sigma-Aldrich, Inc., purity of 98% or more) were weighed such that the ratio of the numbers of atoms of lithium, tantalum, boron, and phosphorus was as shown in Table 1; further, considering a lithium atom flowing out of the system in the firing step, lithium carbonate was weighed in such a way as to provide an amount of 1.1 times the amount of lithium atoms in Table 1; and further, in order to suppress the generation of a by-product in the firing step, diammonium hydrogen phosphate was weighed
  • the obtained mixture was placed in an alumina boat, and the temperature thereof was raised to 1000°C under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the mixture was fired at 1000°C for 4 hours to obtain a solid electrolyte material.
  • the obtained solid electrolyte material was evaluated by powder X-ray diffraction described later, and it was found that the half-width of a diffraction peak having the maximum intensity that was able to be confirmed in the range of 20° ⁇ 2 ⁇ ⁇ 40° was 0.12° and the solid electrolyte material was crystalline.
  • a pressure of 40 MPa was applied with a hydraulic press to any of the obtained solid electrolyte materials to form a disk-shaped tableted body having a diameter of 10 mm and a thickness of 1 mm, and next, a pressure of 300 MPa was applied to the disk-shaped tableted body by CIP (cold isostatic pressing) to manufacture a pellet.
  • CIP cold isostatic pressing
  • the obtained pellet was placed in an alumina boat, and the temperature thereof was raised to the temperature (650°C, 700°C, 750°C, or 850°C) shown in the column of Total conductivity in Table 1 under a condition of a temperature rise rate of 10°C/min in an atmosphere of air (flow rate: 100 mL/min) using a rotary firing furnace (manufactured by Motoyama Co., Ltd.), and the pellet was fired at the above temperature for 96 hours to obtain a sintered body.
  • the temperature of the obtained sintered body was lowered to room temperature, then taken out from the rotary firing furnace, transferred into a dehumidified nitrogen gas atmosphere, and stored.
  • a gold layer was formed on each of both sides of the obtained sintered body using a sputtering machine to obtain a measurement pellet for ion conductivity evaluation.
  • the obtained measurement pellet was kept in a constant temperature bath at 25°C for 2 hours before measurement.
  • AC impedance measurement was carried out at 25°C in a frequency range of 1 Hz to 10 MHz under a condition of an amplitude of 25 mV using an impedance analyzer (manufactured by Solartron Analytical, model number: 1260A).
  • the obtained impedance spectrum was fitted with an equivalent circuit using the equivalent circuit analysis software ZView included with the analyzer to determine the lithium ion conductivity within a crystal grain and the lithium ion conductivity at a crystal grain boundary, and these were added up to calculate the total conductivity. Results are shown in Table 1.
  • the total conductivity of the sintered body obtained by firing at 650°C using the solid electrolyte material obtained in Comparative Example 1 was too low to obtain a measured value.
  • an amorphous solid electrolyte material including lithium, tantalum, phosphorus, and oxygen as constituent elements and having a content of the phosphorus element of more than 5.3 atomic % and less than 8.3 atomic % can allow a sintered body having a sufficient total conductivity to be obtained even when fired at a low temperature of 900°C or less.

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EP21822208.1A 2020-06-10 2021-06-09 Matériau d'électrolyte solide, électrolyte solide, procédé de production d'électrolyte solide et batterie entièrement solide Pending EP4167319A4 (fr)

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